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<h1 id="openmpi-support">OpenMPI Support<a class="headerlink" href="#openmpi-support" title="Permanent link"></a></h1>
<h2 id="introduction">Introduction<a class="headerlink" href="#introduction" title="Permanent link"></a></h2>
<p>This document outlines the supported OpenMPI versions in the Merlin7 cluster.</p>
<h3 id="openmpi-supported-versionso">OpenMPI supported versionso<a class="headerlink" href="#openmpi-supported-versionso" title="Permanent link"></a></h3>
<p>The Merlin cluster supports OpenMPI versions across three distinct stages: stable, unstable, and deprecated. Below is an overview of each stage:</p>
<h4 id="stable">Stable<a class="headerlink" href="#stable" title="Permanent link"></a></h4>
<p>Versions in the <code>stable</code> stage are fully functional, thoroughly tested, and officially supported by the Merlin administrators.
These versions are available via <a href="../pmodules/">PModules</a> and <a href="../spack/">Spack</a>, ensuring compatibility and reliability for production use.</p>
<h4 id="unstable">Unstable<a class="headerlink" href="#unstable" title="Permanent link"></a></h4>
<p>Versions in the <code>unstable</code> stage are available for testing and early access to new OpenMPI features.
While these versions can be used, their compilation and configuration are subject to change before they are promoted to the <code>stable</code> stage.
Administrators recommend caution when relying on <code>unstable</code> versions for critical workloads.</p>
<h4 id="deprecated">Deprecated<a class="headerlink" href="#deprecated" title="Permanent link"></a></h4>
<p>Versions in the <code>deprecated</code> stage are no longer supported by the Merlin administrators.
Typically, these include versions no longer supported by the official <a href="https://www.open-mpi.org/software/ompi/v5.0/">OpenMPI</a> project.
While deprecated versions may still be available for use, their functionality cannot be guaranteed, and they will not receive updates or bug fixes.</p>
<h3 id="using-srun-in-merlin7">Using srun in Merlin7<a class="headerlink" href="#using-srun-in-merlin7" title="Permanent link"></a></h3>
<p>In OpenMPI versions prior to 5.0.x, using <code>srun</code> for direct task launches was faster than <code>mpirun</code>.
Although this is no longer the case, <code>srun</code> remains the recommended method due to its simplicity and ease of use.</p>
<p>Key benefits of <code>srun</code>:
* Automatically handles task binding to cores.
* In general, requires less configuration compared to <code>mpirun</code>.
* Best suited for most users, while <code>mpirun</code> is recommended only for advanced MPI configurations.</p>
<p>Guidelines:
* Always adapt your scripts to use srun before seeking support.
* For any module-related issues, please contact the Merlin7 administrators.</p>
<p>Example Usage:
</p><div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-0-1"><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a>srun<span class="w"> </span>./app
</span></code></pre></div><p></p>
<div class="admonition tip">
<p class="admonition-title">Tip</p>
<p>Always run OpenMPI applications with <code>srun</code> for a seamless experience.</p>
</div>
<h3 id="pmix-support-in-merlin7">PMIx Support in Merlin7<a class="headerlink" href="#pmix-support-in-merlin7" title="Permanent link"></a></h3>
<p>Merlin7's SLURM installation includes support for multiple PMI types, including pmix. To view the available options, use the following command:</p>
<div class="language-bash highlight"><span class="filename">Bash</span><pre><span></span><code><span id="__span-1-1"><a id="__codelineno-1-1" name="__codelineno-1-1" href="#__codelineno-1-1"></a>🔥<span class="w"> </span><span class="o">[</span>caubet_m@login001:~<span class="o">]</span><span class="c1"># srun --mpi=list</span>
</span><span id="__span-1-2"><a id="__codelineno-1-2" name="__codelineno-1-2" href="#__codelineno-1-2"></a>MPI<span class="w"> </span>plugin<span class="w"> </span>types<span class="w"> </span>are...
</span><span id="__span-1-3"><a id="__codelineno-1-3" name="__codelineno-1-3" href="#__codelineno-1-3"></a><span class="w"> </span>none
</span><span id="__span-1-4"><a id="__codelineno-1-4" name="__codelineno-1-4" href="#__codelineno-1-4"></a><span class="w"> </span>pmix
</span><span id="__span-1-5"><a id="__codelineno-1-5" name="__codelineno-1-5" href="#__codelineno-1-5"></a><span class="w"> </span>pmi2
</span><span id="__span-1-6"><a id="__codelineno-1-6" name="__codelineno-1-6" href="#__codelineno-1-6"></a><span class="w"> </span>cray_shasta
</span><span id="__span-1-7"><a id="__codelineno-1-7" name="__codelineno-1-7" href="#__codelineno-1-7"></a>specific<span class="w"> </span>pmix<span class="w"> </span>plugin<span class="w"> </span>versions<span class="w"> </span>available:<span class="w"> </span>pmix_v5,pmix_v4,pmix_v3,pmix_v2
</span></code></pre></div>
<p>Important Notes:
* For OpenMPI, always use <code>pmix</code> by specifying the appropriate version (<code>pmix_$version</code>).
When loading an OpenMPI module (via <a href="../pmodules/">PModules</a> or <a href="../spack/">Spack</a>), the corresponding PMIx version will be automatically loaded.
* Users do not need to manually manage PMIx compatibility.</p>
<div class="admonition warning">
<p class="admonition-title">Warning</p>
<p>PMI-2 is not supported in OpenMPI 5.0.0 or later releases. Despite this,
<strong>pmi2</strong> remains the default SLURM PMI type in Merlin7 as it is the
officially supported type and maintains compatibility with other MPI
implementations.</p>
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